Gar-wheel chill



W WILMINGTON. Oar-Wheel Chill.

\Jajtenlred June L 138% ATTORNEYS.

N'PETERS, FHOTD-UTHOGRAPNE. WASHINGTON. D. C.

Uwrren STATES ATENT rrrcE;

'WILLIAM I/VILMINGTON, OF TOLEDO, OHIO.

GAR-WHEEL CHILL.

SPECIFICATION forming part of Letters Patent N0. 228,428, dated June 1, 1880.

Application filed March 26, 1879.

To all whom it may concern Be it known that I, WILLIAM WILMING- TON, of Toledo, in the county of Lucas and State of Ohio, have invented a new and 1111-- proved Oar-Wheel Chill; and Ido hereby declare that the following is a full, clear, and exact description of the same, reference being had to the 2l0OOlD1I)ZLl1 Vll1g drawings, forming part of this specification, in which Figure l is a sectional view of a car-wheel chill constructed in accordance with my invention. Fig. 2 is a sectional view, showing the relation of the chill to the other parts of the mold. Figs. 3 and 4 are similar views, showing modifications.

My invention relates to a novel construction of a chill for regulating the cooling of car-wheels while they are being cast.

In a patentgranted me December 15, 1868,

and reissued August 16, 1870, a groove was left in the face of the chill adjacent to the inner flan ge-face, or face of the flange next to the tread of the wheel. The purpose and object of this groove was to receive sand or other non-conducting material which retarded the cooling of the outer portion of the flange, so as to toughen the same, and which also at the same time increased the depth of chilled iron in the throat of the wheel. The latterresult was produced in thefollowing way: The metal forming the flange portion of the wheel, being that which is first poured, would, in coming in contact with the ordinary chill, suddenly cool and contract in the shape of a ring, which would draw the semi-fluid metal in the throat portion just above away from the chill, and the chilling effect at this point would then cease. My sand-groove, by retarding the cooling of the metal forming the flange, caused the metal to remain for a longer time in contact with the chill at the throat of the wheel, and thus deepened the chilled iron at this point.

My present invention aims at the same general results in improving the character of the wheel, but by a novel construction of mold, in which a hollow circular chamberis cast in the chill or other part of the mold close to the flangeface, and with only a thin wall separating said chamber from the flange-space, and passing into this chamber just a minute or two before the metal is poured a current of superheated steam, whereby the flange-face of the chill or other part of the mold is highly heated to the exclusion of the tread-face, and the metal constituting the flange of the wheel is not allowed to he suddenly cooled in casting the wheel.

111 the drawings, A represents a chill,B the cope, and O the drag or nowel, the whole constituting the car-wheel mold, in which D is the wheel-space, and E the sand packed about the same. In this chill I form, by cores suitably supported, the hollow circular chamber F, which is located close to the flange-face, conforming in shape on one side to the same, so as to leave a thin wall, a, of metal about onefourth of an inch thick, which metal is of one and the same piece with the body of the chill. Communicating with this chamber upon one side is an inlet-pipe, G, and upon the other an outlet-pipe, Gr, through one of which superheated steam is admitted, and through the other of which it is allowed to escape. Now,

the mold having been made up in the usual manner, for a minute or two before pouring the metal into the mold superheated steam is passed through the chamber in the chill, and the flange-face at a of the chill is highly heated without materially heating the tread portion, so that when the metal is poured the metal constituting the flange is not rapidly chilled, so as to involve the objections hereinbefore mentioned, but is slowly cooled, and the metal in the throat portion of the wheel is held long enough in contact with the chill to be hardened to a suflicient depth.

In defining my invention with greater exactness I have to call attention to my patent of October 26, 1875, in which an air-chamber was formed in the flange-face by means of a thin wall of sheet metal covering a groove located at this point, and also to the patent to H. Mooer, dated December 3, 1861, in which a coil of pipe was located in the body of the chill, to give passage to steam through the chill and heat the whole of the same. One difficulty which I have experienced With the air-chamber is the tendency of the thin sheet metal to warp and buckle, and the objection to the Mooer chill is, that in heating the whole body of the chill the chilling efi'ect upon the tread is impaired and the sand at the top of the chill is dried out and loosened.

My present invention possesses the following distinctive advantages: It secures, to a great extent, the same results as the sandgroove originally patented by me without involving the time and labor of packing and ramming the sand into the groove. The metal forming the wall a being continuous around the chamber, there is no buckling or warping such as exists when the air-chamberis formed by a separatepieee of sheet metal. It does not impair the chilling eflect at the tread as does the Mooer chill, but simply retards the cooling of the outer portion of the flange without materially afl'ecting the tread.

In the said Mooer chill it will be perceived that the whole chill is heated by the steampipes within the same. The object of this is to dry ed the moisture which condenses on the chill from the sand, which moisture is objectionable for the reason that it produces an ebullition of the molten iron and makes a rough tread. Although this result is attained in said chill, the heating of the whole body of the same not only reduces the chilling effect on the tread, but causes a drying of the sand at the top of the mold, which, loosening and falling, spoils the wheel.

In my invention it will be seen that the heat from the steam-chamber does not have time to affect any portion of the chill except the flan geface, and hence it neither destroys the chilling effect on the tread nor dries out the sand at the top.

The sand, 00, in that portion of the drag that comes in contact with the chill and forms the outer portion of the flange will be more or less freed from moisture by the heat, and being at the bottom of the mold the sand will not be loosened and displaced, but its dryness and heat only serve to retard the cooling of the metal at this point, which is desirable.

In modifying my invention I may form the steam-chamber in a separate piece of the mold screwed to the chill, as in Fig. 3,orI mayform said chamber in the drag, as in Fig. 4.

Having thus described my invention, what I claim as new is A car-wheel chill formed with a solid body portion, and having an annular chamber located in its flange-face, inclosed by an inner wall, a, formed in one piece with the metal inclosing the other sides of the chamber, and same shape as the adjacent contour of the flange of the wheel, substantially as shown and described.

WILLIAM WILMINGTON.

Witnesses:

GEO. H. BEcKWrrH, R. FULLER. 

